Plastic composition



Patented Sept. 24, 1940 PLASTIO'COMPOSITION Peter J. 'Wiezevich, Elizabeth, N. J., now by judicial'change of name Peter J. Gaylor, and William J. Sparks, Cranford, N. J assignors to Standard Oil Development Company, a corporation of Delaware- No Drawing. Application May 20, 1937, 7 Serial No. 143,758 a 'i Claims. (Cl. 260-13) This invention deals with the production of novel plastic and film forming materials and more specifically, to the manufacture of clear, uniform plastics containing certain polysulfones and cellulose compounds. The invention will be understood from the following description.

Polysulfones are insoluble in most organic solvents and while some solvents can be found to dissolve them, they are usually of the types which are incompatible with plastic and film producing materials such as ethers and esters of cellulose.

It has been found that the polysulfone of allyl chloride is soluble in ketone solvents such as ace- 1 tone and by means ofsuch solvent can be brought into solution with the common cellulose compounds such as nitrate, acetate, ethers and the like. After the removal of such common solvents, as by evaporation, there is produceda homogeneous'plastic composition comprising a cellulose compound and the polysulfone. I

The cellulose compound employed in this invention is anycellulose ester or ether, such as cellulose acetate, nitrate, propionate, butyrate, aceto-butyrate,' laurate, naphthenate, oleate,

stearate, benzyl cellulose, ethyl cellulose and the like. Cellulose esters of the lower fatty acids, e, g., the acetates, are preferred.

The amount of polysulfone added to the cellulose compound may be 1%, 5%,-10%, 20% or even or more, although it is preferable to mamtain less than 50% in the composition. This material imparts exceptional hardness and fireproofwaxes, pigments, dyes, anti-oxidants, metal soaps,

hydrocarbon polymers, halogenated compounds, and the like.

The following example illustrates the present invention:

20 c. c. of allyl chloride is mixed with 20 c. c. of liquid sulfur dioxide and 1 c. c. of par-aldehyde as well as 1 drop of 805! ydrogen peroxide. Re-

pris'ing a cellulose ester of a fatty acid and the ride, and evaporating the ketone' solvent.

action occurs immediately and the mixture begins to boil. If desired, the mixture may be placed in a pressure flask and, allowed to warm to room temperature. A white precipitate (polysulfone) is formed. The polysulfone so prepared is dissolved in acetone, precipitated with water and dried in an oven. e

The dried material is again dissolved in acetone and mixed with an equal weight of high viscosity cellulose acetate in acetone until a clear'solution results. The mixture is then poured on a glass plate and allowed to harden for one day. The resulting film is hard, strongand homogeneous. It may be brushed on tin-plate and dried ma nonhumid atmosphere to give a clean-hard film.

This invention. is not limited to any theory or mechanism of reaction, nor to any example, but only .by the following claims in which the inten- V tion is to limit the invention as broadly as the prior art permits. 7

.We claim:

1. A composition suitable for the preparation of non-inflammable films comprising 5 to 50% of allyl chloride polysulfone and 50 to 95% of cellu-' lose acetate.

,2. A homogeneous ,plastic composition compolysulione of allyl chloride.

3. A composition according to claim 2 in which the cellulose ester is cellulose acetate.

4. The process of preparing a homogeneous plastic composition of low inflammability which. comprises dissolving in a ketone a cellulose ester of a fatty acid and the polysulfone of allyl chlo- 5. A process according to claim {in which the ketone used as a solvent is acetone.

6. A process according to claim 4 in which the cellulose ester is cellulose. acetate.

7. The process of preparing a homogeneous 9 plastic composition of low inflammability which comprises dissolving in acetone cellulose acetate and the polysulione of allyl chloride, and evaporating the acetone.

PETER-'LWEZEVICH. '45 WILLIAMLBPAR KB. 

